As the density \(n_B \rightarrow \infty \) , by asymptotic freedom the EoS approaches that of an ideal gas of dense
quarks and gluons, and so is soft.
In Quantum ChromoDynamics (QCD),
corrections to the quark EoS have been computed in part up to four loop order
[1]}, [2]}, [3]}, [4]}, [5]}. However, perturbation theory
is only useful down to densities much larger than \(n_{\rm sat}\) . At very high densities, excitations near the Fermi surface
are dominated by color superconductivity [6]}, [7]}, [8]}.
